Optical properties of metallic sodium tungsten bronzes: Analysis of free- and bound-electron contributions

1977 ◽  
Vol 15 (10) ◽  
pp. 4623-4630 ◽  
Author(s):  
P. Camagni ◽  
A. Manara ◽  
G. Campagnoli ◽  
A. Gustinetti ◽  
A. Stella
Keyword(s):  
Optical Properties ◽  
Metallic Sodium ◽  
Sodium Tungsten ◽  
Bound Electron

scholarly journals OPTICAL PROPERTIES OF AMORPHOUS THIN FILMS OF SODIUM-TUNGSTEN OXIDE BRONZES

2021 ◽  
pp. 430-438
Author(s):  
Борис Магометович Хуболов
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Tungsten Oxide ◽  
Optical Density ◽  
Spectral Characteristics ◽  
Wide Band ◽  
Blue Color ◽  
Amorphous Thin Films ◽  
Near Ultraviolet ◽  
Sodium Tungsten

В работе измерены спектральные зависимости оптической плотности аморфных тонких пленок оксидной натрий-вольфрамовой бронзы тетрагональной структуры состава NaWO, конденсированной на стеклянные подложки, термостатированные при температурах 373,473 и 573 K, а так же отожженные на воздухе и в вакууме, и электрохромно окрашенных. В качестве исследуемой оптической характеристики была выбрана оптическая плотность D, пропорциональная, как известно, коэффициенту поглощения. Спектральные измерения пленок, осажденных на подложки в диапазоне температур 373,473 и 573 K показали однотипность спектральных характеристик, с пиком экситонного поглощения в ближнем ультрафиолете. Полоса минимального поглощения лежит в диапазоне длин волн 400÷460 нм, а примесного поглощения - широкой полосой в области 650 ÷1000 нм с максимумом в диапазоне 900÷1000 нм. Подобная спектральная характеристика и определяет сине-голубой цвет тонкой пленки на просвет. Изучение оптических свойств тонких пленок натрий-вольфрамовых бронз представляет собой актуальную задачу. The spectral dependences were measured of the optical density of amorphous thin films of sodium-tungsten oxide bronze of the tetragonal structure and the composition NaWO, condensed on glass substrates, thermostated at temperatures of 373, 473 and 573 K, as well as annealed in air vacuum, and electrochromically colored. The optical density D, which is proportional, as is known, to the absorption coefficient, was chosen as the studied optical characteristic. Spectral measurements of films deposited on substrates in the temperature range of 373, 473 and 573 K showed the same type of spectral characteristics, with a peak of the exciton absorption in the near ultraviolet. The band of minimum absorption lies in the wavelength range of 400÷460 nm, while that of the impurity absorption is a wide band in the region of 650÷1000 nm with a maximum in the range of 900÷1000 nm. This spectral characteristic determines the blue-blue color of a thin film in transmission. The study of the optical properties of thin films of sodium-tungsten bronzes is an urgent problem.

The surface structure of the metallic sodium tungsten bronze Na0.667WO3(001)

2000 ◽  
Vol 460 (1-3) ◽  
pp. 277-291 ◽  
Author(s):  
F.H. Jones ◽  
K. Rawlings ◽  
R.A. Dixon ◽  
T.W. Fishlock ◽  
R.G. Egdell
Keyword(s):  
Surface Structure ◽  
Tungsten Bronze ◽  
Metallic Sodium ◽  
Sodium Tungsten ◽  
Sodium Tungsten Bronze

Effect of lead oxide on the optical properties and radiation shielding efficiency of antimony-sodium-tungsten glasses

2020 ◽  
Vol 126 (10) ◽  
Author(s):  
Imed Boukhris ◽  
Imen Kebaili ◽  
M. S. Al-Buriahi ◽  
Chahkrit Sriwunkum ◽  
M. I. Sayyed
Keyword(s):  
Optical Properties ◽  
Lead Oxide ◽  
Radiation Shielding ◽  
Sodium Tungsten

scholarly journals Tunable Transparency and NIR-Shielding Properties of Nanocrystalline Sodium Tungsten Bronzes

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 731
Author(s):  
Luomeng Chao ◽  
Changwei Sun ◽  
Jianyong Dou ◽  
Jiaxin Li ◽  
Jia Liu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Visible Region ◽  
Theoretical Data ◽  
Optical Filters ◽  
Dipole Approximation ◽  
Infrared Light ◽  
Sodium Tungsten ◽  
Shielding Properties ◽  
Heat Shielding

The NaxWO3 nanoparticles with different x were synthesized by a solvothermal method and the absorption behavior in visible and near-infrared light (NIR) region was studied. Well-crystallized nanoparticles with sizes of several tens of nanometers were confirmed by XRD, SEM and TEM methods. The absorption valley in visible region shifted from 555 nm to 514 nm and the corresponding absorption peak in NIR region shifted from 1733 nm to 1498 nm with the increasing x. In addition, the extinction behavior of NaxWO3 nanoparticles with higher x values were simulated by discrete dipole approximation method and results showed that the changing behavior of optical properties was in good agreement with the experimental results. The experimental and theoretical data indicate that the transparency and NIR-shielding properties of NaxWO3 nanoparticles in the visible and NIR region can be continuously adjusted by x value in the whole range of 0 < x < 1. These tunable optical properties of nanocrystalline NaxWO3 will expand its application in the fields of transparent heat-shielding materials or optical filters.

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